Legend Mining Ltd (ASX:LEG) has identified two compelling, high-priority nickel-copper sulphide target areas at Octagonal prospect within the Rockford Project in Western Australia’s Fraser Range which it plans to test next month with diamond drilling.
Targets A and B were selected for the initial diamond drilling campaign for 2023 following target generation, design and ranking work.
“Most exciting targets”
“They both qualify as the most exciting diamond drill targets the team has seen at our Rockford project since Legend started in the Fraser Range in 2015,” said Legend’s managing director Mark Wilson.
Target area A will be tested with a diamond drill hole targeting interpreted extensions of the Octagonal intrusion based on seismic interpretation while a diamond hole at target area B will test a seismic feature interpreted as intrusion, associated with a conductive 2D AMT feature at depth.
Priority target areas and proposed diamond drill holes shown with Octagonal intrusion model, IP anomalies, 2D & 3D AMT anomalies and existing drilling with visual nickel-copper mineralisation on AMAG.
Diamond drilling next month
Legend Mining, which holds a large tenement package within the prolific Fraser Range which hosts large nickel-copper and gold operations, plans to start the two-hole diamond drill program on May 15, 2023.
“Both these target areas have multiple data sets supporting the potential for significant nickel-copper sulphide accumulations and the Legend team is looking forward to the rods turning in a few weeks’ time,” Wilson said.
Testing target A
The diamond hole at target A will extend to test a highly chargeable IP anomaly before continuing to test the top of a large AMT conductor.
Evidence from seismic data, IP and 3D AMT anomalies, structural interpretation, gravity modelling and existing drilling data suggests strong potential for the mineralised Octagonal intrusion to extend outside the expressed ‘eye’ feature as depicted in aeromagnetics.
Target B plan
At target B, structural analysis and seismic modelling, coupled with AMT modelling and proximal diamond drilling suggests the Octagonal intrusion extends at depth.
Proximal drilling in hole OCT0002 indicates encouraging nickel-copper mineralisation, further enhancing the prospectivity of target B.
Diamond drill core tray from OCT0002 with visual nickel-copper sulphide mineralisation, proximal to target area B.
The depth of the extensive Octagonal Intrusive Complex makes it blind to surface EM below 500 metres, therefore opening up a very large and prospective search space below current drilling.
Seismic a key tool
Both proposed diamond drill holes have a nominal planned depth of 1,000 metres.
Seismic has been a key tool used by Legend in refining drill targets at depth.
Rockford Project prospect locations on gravity.
All completed diamond drill holes will be subject to a suite of downhole geophysics, including EM and petrophysical property measurements, with collected data to aid in direct targeting for economic sulphide accumulations as well as refinement of the existing seismic cube.